Automatic relief-valve.



0. E. MISER.

AUTOMATIC RELIEF VALVE.

APPLIOATION FILED JULY 3, 1911.

19019,.51 1 Patnted Mar. 5, 1912.

- I N V E N TOR.

xamfs E Mas/2. z. mwuz, By Mam A TTORNE Y.

UNITED sra'rpspa r ce.

CHARLES E. MISER, F WATER-TOWN, NEW YORK, ASSIG-NOR TO MISER-SHAFF SPE- CIALTY COMPANY, OF WATERTQWN, NEW YORK, A CQRPORATION OF NEW YORK..

AUTOMATIC RELIEF-VALVE.

Specification of Letters Patent.

Patented Mar. 5, 1912.

Application filed inly 3, 1911. Serial No. 636,747.

' tertown, in the county of Jefferson and State of New York, have invented certain new and useful Improvements in Automatic Relief- Valves, of which the following is a specification. 7

This invention relates to improvements in relief valves, designed for use in connection with tanksemployed for holding and .storing liquids of various kinds, and the invention relates particularly to adevice adapted for automatically controlling the filling and emptying of such tanks.

The object of the invention is to provide a novel, simple, efl'e'ctive and inexpensive device of the class, which is capable of being connected to the top of a tank, for automatically. relieving the pressure due to the confining of the atmosphericpressure contained in the tank, during the interval the tank is being'filled, and a further object is to provide independent means for. breaking or relieving the vacuum wh ch is produced in the tank by the drawing off of the liquid.

The various features and parts of the device will be readily understood from the detailed description which follows, and by reference to the accompanying drawing, which forms a part of this specification, and in whic h I Figure 1 is a view of a tank having my automatic relief valves applied ready for service. Fig. 2 is an enlarged side elevation of the complete device. Fig. 3 is a central vertical longitudinal section; showing the construction, arrangementand operation of the several parts of the device. Fig. 4 is a part plan and part horizontal section, taken' on line 4-4 of Fig. 2. .Fig. 5 is a horizontal section, taken on line 5-5 of Fig. 3.

Similar characters of reference are assigned to corresponding parts throughout the several views.

In the drawing, 2 represents a tank for containing liquid, which may be constructed in any suitable manner, and 3 represents a pipe which may-be. employed for filling, as well as, for drawing off the liquid from the tank. The pipe 3 may be disposed at any convenient point, but is preferably locatecat or near the bottom of the tank.

, As a rule, tanks employed for storing liq uids, when empty, are charged with atmospheric pressure, which enters the tanks and replaces the contents previously drawn ofi.

vTo refill the empty tanks, it is necessary to displace or draw off the air which is confined in the tanks, otherwise the tanks can only be partially filled. l'leretofore, hand-operated valves or cocks have been connected to the tops of the tanks for relicving'or drawing off the atmospheric pressure, and where tanks are frequently filled and emptied, considerable time and'labor are consumed inthe operation of the said valves. is filled, the usual practice is to close the After a tank valves and all other vents to prevent the escape or loss of the contents. \Vhen the contents of a tank are drawn off, the said valves or other suitable vents mustbe opened, in order to permit the liquid to freely gravitate or flow from the tank. If no vents or openings are provided, at or near the top of the tank, the drawing off of the liquid creates a vacuum in the upper portion of the tank, which invariably retards, and sometimes entirely sto )s the flow of the liquid from the tank. nder the old'practice referred to, whether the tanks are being filled or emptied, an attendant must open and close the valves, in order to relieve the tank of the pressure and vacuum, for permitting the complete refilling and emptying of the tanks. To remedy these defects and to save the time and labor aforesaid, it is an object of the present invention to provide a novel and simple automatic device, which will now be described.

1. represents a one-part casing or body, having a vertically disposed cylindrical portion 5, which incloses a relatively large pressure receiving chamberfi. The lower end of the casing is preferably externally threaded at 7 for screwing the same into a suitably threaded opening in the top'of the tank. Above the threaded portion 7 is a ledge or shoulder 8, which is preferably formed hexagonal to receive a wrench for applying the fitting to the tank. Near the upper end of the cylindrical portion 5, inside the casing, is disposed a horizontal floor or'wall 9, having a beveled or countersunk perforation or port 10, arranged concentric to the chamber 6, to provide. a seat for a cone-shaped valve 11, which is disposed in an exhaust chamber 12 positioned directly above the floor 9. Valve 11 has a stem .13 arranged concentric to its body.

WhlCl'l 1S confined-in the tank, during the The inner end of the plug 15 has a concentric socket 16, to receive the free end of the stem 13 of valve 11, the said socket being large enough to permit the free reciprocal playing of the valve stem, during the autp;

matic working of the valve 11. The valve 11 is raised-by the compression of the air filling operations, and after the said pressure is relieved,v 0r exhausted, from the chamber 6 and the tank, by the opening of the valve 11, the said valve gravitates into its seat- 10, and closes the said vent. In case the tanks contain liquid which readily evaporates, it is essential that the valve 11 be held tightly in the closed position, excepting When operated for exhausting the pressure, as described. To that 'end the valve 11 should be made heavy enough to efiect a positive seating and closing of the opening 10 by gravity. After the air pressure in the tank passes through the port or opening 10, it enters the chamber 12, and from there it escapes to the atmosphere through oppositely-facing slotted openings l616,

, which are formed in the side walls of the chamber 12. During the interval in which the liquid is being drawn from the tank, the

'. means of a horizontal passage or port- 15).

The bottom of the chamber 18, which corresponds to the floor 9, has a similar beveled or countersunk circular opening 20, which l. claim as new and forms an annular seat for a valve 21. The

. valve 21 has a concentric upwardly extend ing stem 22, which is received in and guided by a socket 23- formed in a plug 24, which 15 screwed into a threaded opening25 arranged in the top of the part 17 concentric to the port 20. The openings 14: and 25 are provided for facilitating the insertion of valves 11 and 21.

26 represents a relatively small in'take chamber disposed directly beneath and concentric to the valve 21, and this chamber communicates with the atmosphere bymea ns of oppositely arranged slots 2'i27.

The valve 21 is normaliy seated in th opening 20 in the bottom of the chamber 18, and is not disturbed by the compression of the air during the filling of the tank, the sai" d 'ug the iiliin inc g li'S power the valve 21 in closed position, hile at the same time it exerts its full power for ra'is ing the valve 11 for relieving the i'm prisoned air. \Vhen, however, the liquid 1n the tank is drawn oii, the suction or vacu um created by the lowerin of the level of the liquid, pulls downwarc ly' on the valve 11,.seatin time it li ts the valve 21 and opens the port 20 for admitting atmospheric pressure through the slots 27, intake chamber 26 and the port 20. The admission of the air into the top portion of the tank, breaks or'de stroys the vacuum and allows the liquid to flow freely from the tank.

For convenience and economy in the manufacture of the parts, the valves 11. and 21 are'preferably made the same'size and Weight, and the plugs 15 and 2e are also preferably made alike, and the respective parts are therefore interchangeable. 1

The dotted lines in Fig. 3 indicate the open positions of the valves 11 and. 21 for relieving the pressure during the filling, and

also for breaking or preventing a vacuum during the drawing-0E of the liquid from the tank. p

The operation of my vdevice is entirely automatic, and after it has been. installed upon a tank, it requires no attention or care. The operation of the valves is positive, and when properly constructed and applied,

there is nodanger of any of the parts get ting out oforder, or requiring any repairs.

It is obvipus that my improved relief valves may be applied to any make or style of tanks';,,that the device willwork with-the sarheetlisincy and perform all of their functions, no matter What kind of, liquid is ,Jstorejd in the tanks, and. that some changes it more tightly, and at the same o'r-modifications may liemade in the parts of the device Within the scope defined by the appended claims, Without departing fr'o plthe spirit ofniy invention.

liavmg thus described my invent-ion, what rersPatent, is 1 a v 1 v 1. In a relief valve,-t-he combination of a main casing and a lateral casing, said main casing having a. receiving chamber and an exhaust chamber disposed abovesaid receiving chamber, said lateral casing having an auxiliary chamber and an intake chamber disposed below the auxiliary chamber, thechamber adapted to supply atn'iospheric pressure to said casings, when acted upon by a vacuum or suction in the tank.

:1 ccinbination, casing having a vertically arranged cylindrical portion,

desire to secure by Letinclosing a common receiving chamber and having a laterally arranged portion communlcatlng wlth the recelvmg chamber lts lowermost end comprlsmg an 'lntake chamber, the mam casmg havlng an exhaust chamber disposed above the recelvmg chamher, the lateral portlon havlng an auxlliary V chamber disposed above an intake chamber,

seat dispo'sed between a valve seat disposed between the receiving chamber and the exhaust-chamber, a valve the-auxiliaryend the intake chambers,

chamber adapted to relieve the air pressure from the receiving and auxiliary chumh s, and a valve in the auztiliery cbmnber adapted to relieve or destroy a vacuum in the receiving and auxiliary chambers;

In testimony whereof I. afiix my signature in presence of two witnesses.

FnEDKfG PLORK, GEO. W. ADAMS. 

